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Is it a hot electrical smell, or more like rubber? if rubber, it is probably the "cogged" drive belt. If it is electrical and the older
style speed controller it needs to be repaired. And it most likely
that device has a catch internally supplying more power than normal.
I would be willing to bet it is your electricity or your outlets. First try your machine in a different room in your home. If it still does it then take it to a friends across town. If it works at her house but not yours, you know you have an electricity problem in your house... or the lines coming into your house. Remember these machines need a certain amperes or voltage to work. If they don't get what they need it won't power up.
It could be that your sewing machine just saved your life by pointing out a problem with your electricity... listen to it. ;)
try changing needles clean under the needle plate & in the bobbin area for loose thread or lint make sure the bobbin is inserted into the bobbin case correctly--if the machine won't pick the thread up from the bobbin correctly take the bobbin out of the case & turn it around & try it that way.
I guessing that from what you say broken both needles you are talking about a serger, unless you are using twin needles in a sewing machine if the power has gone off, have you tried turning off the machine & turning it back on, if that doesn't work then it's possible that the power cord may have gone out, or the on & off switch may have gone out. the only things broken needles will do is knock the machine out of time or jam it up
have you checked to make sure the power cord is pushed in correctly?
if the power cord isn't the problem then it may need to be checked by a service tech, because it's not suppose to be running slow just a few months after you bought it.
I would call the people you bought it from & tell them what it's doing & see if they'll give you another one, I've been sewing for 30+ years & I wouldn't keep the machine.
Likely the problem is a blown fuse in the S-Print (power supply).
You must have a grounding wrist strap when working with a Bernina Activa. They are extremely sensitive and can easily destroy the main circuit board if you don't use a wrist strap. You can get one at Radio Shack for less than $5.
The power supply is the square 1/3 of the machine on the back on the handwheel side.
You can remove the power supply by removing the long torx screw on the rear of the machine and tilting out enough to unplug the connector.
Then dismantle the power supply until you can get to the fuse. Test the fuse with a continuity tester. If the fuse is blown, buy an exact fuse. Don not deviate.
If the fuse is not blown, you may need a new power supply.
Almost-certainly due to the main switching transistor having blown, however this is not necessarily an easy fix ... very often when this happens it takes a number of other components with it ... I had one last week where no less than 10 other components had got fried (and I do mean fried beyond recognition, due to somebody having put a bigger fuse in - doh! - dont ever do this ... it's dangerous!). Best thing to do if you dont really know what you're doing is to get a complete exchange 'L'-print.